Soft lighting and a painterly approach to capturing the detail holds this set together nicely. The droplets, lightbulb and hob (?) knob are the most successful here, capturing the droplets like this works well and shows good technical ability. The light switch and U-bend piping however seem a bit ordinary, by simply changing the angle of the shot or tightening up the composition and honing in further on one particular detail, you could create more a abstract image (as is seen in the rest of the set). 'Utilities 4' (is it a radiator?) has potential, try using the lines and shadows around the lights to create a better composition. It is obvious that you have thought about some of these images with care and detail - and it shows in the result.